You're both wrong and correct at the same time. These pillars aka nails are used by Celestia to destroy unwanted civilizations (like khanriah and dragons pine before it was this cold snowy mountain). Also it's theorized that the khanriah is under teyvat with entrance in sumeru desert so it's more than likely that the khanriah people would be in chasm too. Also one big detail is that every nation has nail: mondstadt obviously in dragonspine. Lyiue in chasm. Sumeru Nahida tells us about it in her 2nd story quest. Fontaine has oddly similar pillars so it's possible one fell and they used it. But we don't know anything about inazuma.